Japan Flora: pseudobulbs elongate-conical, 1-3 cm. long, few-scaled while young; leaves usually solitary, narrowly oblong or linear-ob-long, conduplicate, ribbed, 10-18 cm. long, 1.5-3 cm. wide, acuminate at both ends, distinctly jointed with the sheath; peduncles 10-18 cm. long, terminal on the pseudobulbs, flat, narrowly wing-margined, arcuately recurved in upper part; racemes loosely 5- to 10-flowered, ascending; bracts subulate- lanceolate, 3-5 mm. long; flowers pale yellowish green, onesided; dorsal sepal linear-oblong, obtuse, 6-7 mm. long, the lateral ones slightly shorter, spreading, arcuate in upper part; petals linear, 6-7 mm. long, obtuse; lip cuneate-obovate, about 5 mm. long, rounded-truncate, smooth, gradually recurved at tip, with 2 indistinct callosities at the base inside; column winged near the tip; capsules pedicelled, clavate-fusiform, 8-10 mm. long. Oct-Dec.

Shikoku, Kyushu (s. distr.). Ryukyus and Formosa.